Purchase a Kriss modulator and we'll tell you how to get the needed documentation to
show you're in compliance in the event a trooper stops you and questions the legality.


See bottom of page for type of headlights that may be modulated.



the law and the headlight modulator

Our headlight modulator does not have a feature allowing you to operate the horn or some other button to initiate the modulator for a few seconds, or a burst, because this feature is not legal... especially at night.
We don't offer different modulations rates, 240 cycles per minute is what's legal. Faster/slower is ILLEGAL.

If we did offer you this as an added feature the modulators would not be in compliance with the d.o.t. regulations which means you wouldn't have a defense should you get stopped or receive a citation from your local trooper. Don't just take our word or anyone else's on this issue. You should check with the d.o.t.

At Kriss Industries we build our modulators in adherence with the federal standards!
FYI - The government sets the standards and the manufacturer is supposed to comply and then state that the item is "in compliance". However, the government does not examine each product on the market for compliance and "never" approves a specific product. If you're told that the d.o.t has approved an individual product you are not being provided truthful information. They don't maintain an approval department or an "approved list", not even for your favorite car or motorcycle brand. Want to confirm this, just call the d.o.t and ask for their approved list of products or vendors.

The d.o.t is very specific with respect to the level of light at which the modulation starts and stops. We added
a four (4) second delay in shut off so it wouldn't immediately stop modulating when passing through a short
underpass. Our design doesn't affect the required light level. We see that some others in an effort to try and
copy us have included an adjustment to the light sensor. This changes the level of light for on/off set by the d.o.t.
This doesn't meet d.o.t rules.

If you find a headlight modulator with other fancy bells & whistles", different flashing sequences
or an adjustable light sensor then the modulator is not in compliance with the law!

For an LED headlight it requires a special Kriss design to meet regulations.

Headlight Modulators "are legal" if they meet the d.o.t. requirements. (see below for short version of the U.S. rules)

Do you need information about the United States US flagFederal Regulations?

A copy of these standards may be obtained by writing the d.o.t. in Washington, D.C.

We cannot assure that these links will not change over time and we don't maintain a watch of government sites.

FMVSS 108 (Federal Motor Vehicle Safety Standards) (49 CFR Part 571.108 S7.9.4) allows motorcycle headlight modulation systems in all 50 states provided they comply with the standards set forth in this section.

Title 49 USC 30103(b1) (US Codes) prohibits any state from forbidding a system that conforms to FMVSS 108.



Canada prescribes the same standards as the US and allows modulators meeting these standards.
(We do not provide a direct to the Canadian Regulations)
(see link just above flag for pdf with Canadian statute)
  Provision is made in the Queensland Vehicle Standards Regulations ( Transport Operations (Road Use Management - Vehicle Standards and Safety) Regulation 1999) A motorbike may be equipped with a headlight modulation system.






Subpart B--Federal Motor Vehicle Safety Standards

Sec. 571.108 Standard No. 108; Lamps, reflective devices, and associated equipment.

S7.9.4 Motorcycle headlamp modulation system.
S7.9.4.1 A headlamp on a motorcycle may be wired to modulate either the upper beam or the lower beam from its maximum intensity to a lesser intensity, provided that:
    (a) The rate of modulation shall be 240 plus-minus 40 cycles per minute.
    (b) The headlamp shall be operated at maximum power for 50 to 70 percent of each cycle.
    (c) The lowest intensity at any test point shall be not less than 17 percent of the maximum intensity measured at the same point.
    (d) The modulator switch shall be wired in the power lead of the beam filament being modulated and not in the ground side of the circuit.
    (e) Means shall be provided so that both the lower beam and upper beam remain operable in the event of a modulator failure.
    (f) The system shall include a sensor mounted with the axis of its sensing element perpendicular to a horizontal plane. Headlamp modulation shall cease whenever the level of light emitted by a tungsten filament light operating at 3000 deg. Kelvin is either less than 270 lux (25 foot-candles) of direct light for upward pointing sensors or less than 60 lux (5.6 foot-candles) of reflected light for downward pointing sensors. The light is measured by a silicon cell type light meter that is located at the sensor and pointing in the same direction as the sensor. A Kodak Gray Card (Kodak R-27) is placed at ground level to simulate the road surface in testing downward pointing sensors.
    (g) When tested in accordance with the test profile shown in Figure 9,the voltage drop across the modulator when the lamp is on at all test conditions for 12 volt systems and 6 volt systems shall not be greater than .45 volt. The modulator shall meet all the provisions of the standard after completion of the test profile shown in Figure 9.
    (h) Means shall be provided so that both the lower and upper beam function at design voltage when the headlamp control switch is in either the lower or upper beam position when the modulator is off.
    S7.9.4.2(a) Each motorcycle headlamp modulator not intended as original equipment, or its container, shall be labeled with the maximum wattage, and the minimum wattage appropriate for its use. Additionally, each such modulator shall comply with S7.9.4.1 (a) through (g) when connected to a headlamp of the maximum rated power and a headlamp of the minimum rated power, and shall provide means so that the modulated beam functions at design voltage when the modulator is off.
    (b) Instructions, with a diagram, shall be provided for mounting the light sensor including location on the motorcycle, distance above the road surface, and orientation with respect to the light.


Definition of a motorcycle headlight by the d.o.t. - "The headlight"

What's not a headlight
Passing lamps positioned on either side of the headlight, driving lights positioned on the lower fairing, crash bars or mirrors.
If it's not the primary headlight it's not legal to be modulated.

Not all modulators are compatible with Can-Bus electrical systems.

© Kriss Industries Inc 2017 all rights reserved